Electromagnetic valve for ORVR system

Details Electromagnetic valve for ORVR system Electromagnetic valve for ORVR system

2001-02-22

2003-03-04

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S520000, C251S129170

Reexamination Certificate

active

06526951

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2000-49447 filed on Feb. 25, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic valve working as a pressure regulating valve and an opening/closing valve suitable for use in an ORVR system.
2. Description of Related Art
A conventional vapor fuel treating system requires an ORVR (On Board Refueling Vapor Recovery) system shown in FIG.
7
. In the ORVR system, vapor fuel arising in a fuel tank during fuel supply is not discharged to atmosphere, and a canister adsorbs the vapor fuel.
In the ORVR system shown in
FIG. 7
, pipes
202
and
205
connect a fuel tank
200
with a canister
210
. A pressure sensor
201
is provided in the fuel tank
200
for detecting pressure inside the fuel tank
200
. When a vapor fuel leak is detected, an electromagnetic valve
203
opens to allow the fuel tank
200
to communicate with the canister
210
. An internal pressure valve
204
includes a diaphragm, and maintains the pressure inside the fuel tank
200
over a predetermined pressure. A fuel supply valve
206
includes a diaphragm. When the pressure inside the fuel tank
200
rises due to a fuel supply, the fuel supply valve
206
opens to discharge the vapor fuel into the canister
210
such that the canister
210
adsorbs the vapor fuel. When a purge valve
213
opens, an intake air passage
208
communicates with the canister
210
.
In the conventional ORVR system in
FIG. 7
, there is need to prepare a lot of valves and pipes such as two pipes
202
,
205
for connecting the fuel tank
200
with the canister
210
, electromagnetic valve
203
, internal pressure valve
204
, and supply valve
206
. Thus, an installation space for these parts is necessary, and the number of installations is increased.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electromagnetic valve working as pressure regulating valve and opening/closing valve, for reducing the number of parts.
According to a first aspect of the present invention, when a coil is not energized, a pressure-receiving member switches a communication between a first passage and a second passage due to pressure difference between a first pressure chamber and a second pressure chamber. That is, an electromagnetic valve works as a pressure regulating valve. When the coil is electrically energized, the first passage communicates with the second passage regardless the pressure difference between the first pressure chamber and the second pressure chamber. That is, the electromagnetic valve works as an electromagnetic opening/closing valve.
In this way, a single electromagnetic valve works as pressure regulating valve and opening/closing valve. Thus, the number of parts is reduced, so that the system is easily assembled. The system is compacted, so that the system is easily installed in a narrow space.
According to a second aspect of the present invention, a stator magnetically attracts the permanent magnet provided in the moving core. A communication between the first passage and the second passage is shut when the moving core is close to the stator. Thus, even when the magnetic force of the permanent magnet is small, sufficient force for closing valve is attained. Further, the coil is energized to generate a magnetic repelling force between the permanent magnet and the stator, so that the moving core leaves the stator. Since air gap between the moving core and the stator is small, even when the wind number of the coil is small, the electromagnetic valve can open, thereby compacting the electromagnetic valve.


REFERENCES:
patent: 4988074 (1991-01-01), Najmolhoda
patent: 5020771 (1991-06-01), Nakatsukasa et al.
patent: 5280775 (1994-01-01), Tanamura et al.
patent: 5599003 (1997-02-01), Seemann et al.
patent: 6079435 (2000-06-01), Franz et al.
patent: 7-233882 (1995-09-01), None
patent: 8-93576 (1996-04-01), None

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